<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>简介</title>

 </head>
 <body><div class="manualnavbar" style="text-align: center;">
 <div class="prev" style="text-align: left; float: left;"><a href="book.dbase.html">dBase</a></div>
 <div class="next" style="text-align: right; float: right;"><a href="dbase.setup.html">安装／配置</a></div>
 <div class="up"><a href="book.dbase.html">dBase</a></div>
 <div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="intro.dbase" class="preface">
  <h1 class="title">简介</h1>
  <p class="para">
   These functions allow you to access records stored in dBase-format
   (dbf) databases.
  </p>
  <p class="para">
   dBase files are simple sequential files of fixed length records. 
   Records are appended to the end of the file and delete records are
   kept until you call <span class="function"><a href="function.dbase-pack.html" class="function">dbase_pack()</a></span>.
  </p>
  <p class="para">
   The types of dBase fields available are:
   <table class="doctable table">
    <caption><strong>Available types of fields</strong></caption>
    
     <thead>
      <tr>
       <th>Field</th>
       <th>dBase Type</th>
       <th>Format</th>
       <th>Additional information</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td><em>M</em></td>
       <td>Memo</td>
       <td>n/a</td>
       <td>This type is not supported by PHP, such field will be ignored</td>
      </tr>

      <tr>
       <td><em>D</em></td>
       <td>Date</td>
       <td><em>YYYYMMDD</em></td>
       <td>The field length is limited to 8</td>
      </tr>

      <tr>
       <td><em>N</em></td>
       <td>Number</td>
       <td>A number</td>
       <td>
        You must declare a length and a precision (the number of digits
        after the decimal point)
       </td>
      </tr>

      <tr>
       <td><em>C</em></td>
       <td>String</td>
       <td>A string</td>
       <td>You must declare a length. When retrieving data, the string
       will be right-padded with spaces to fit the declared length.</td>
      </tr>

      <tr>
       <td><em>L</em></td>
       <td>Boolean</td>
       <td><em>T</em> or <em>Y</em> for <strong><code>TRUE</code></strong>, 
       <em>F</em> or <em>N</em> for <strong><code>FALSE</code></strong></td>
       <td>Stored and returned as an integer (1 or 0)</td>
      </tr>

      <tr>
       <td><em>F</em></td>
       <td>Float</td>
       <td>A float number</td>
       <td>Support for this type of field was added in PHP 5.2.0</td>
      </tr>

     </tbody>
    
   </table>

  </p>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    此扩展已被移至
<a href="http://pecl.php.net/" class="link external">&raquo;&nbsp;PECL</a> 资源库且不再与 PHP 捆绑。5.3.0.
   </p>
  </p></blockquote>
  <div class="warning"><strong class="warning">Warning</strong>
   <p class="para">
    There is no support for indexes or memo fields. There is no
    support for locking, too. Two concurrent web server processes
    modifying the same dBase file will very likely ruin your database.
   </p>
   <p class="para">
    We recommend that you do not use dBase files as your production
    database. Choose any real SQL server instead; <a href="http://www.mysql.com/" class="link external">&raquo;&nbsp;MySQL</a> or <a href="http://www.postgresql.org/" class="link external">&raquo;&nbsp;Postgres</a>
    are common choices with PHP. dBase support is here to allow you to
    import and export data to and from your web database, because the
    file format is commonly understood by Windows spreadsheets and
    organizers.
   </p>
  </div>
 </div><hr /><div class="manualnavbar" style="text-align: center;">
 <div class="prev" style="text-align: left; float: left;"><a href="book.dbase.html">dBase</a></div>
 <div class="next" style="text-align: right; float: right;"><a href="dbase.setup.html">安装／配置</a></div>
 <div class="up"><a href="book.dbase.html">dBase</a></div>
 <div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
